fix for linux_sysroot issue

Author: Alami-Amine

build/chip/fuzz_test.gni

@@ -102,13 +102,12 @@ template("chip_pw_fuzz_target") {
                                  "configs",
                                ])
 
-        # TODO see what to do with this, I added it to try running FuzzTest with compatibility mode, since this is the mode supported by OSS-fuzz
+        # TODO: remove this
+        #just a test for running FuzzTest with libfuzzer-compatibility mode, since this is the mode supported by OSS-fuzz
         # defines = [
-        #   "FUZZTEST_COMPATIBILITY_MODE=libfuzzer",
+        # "FUZZTEST_COMPATIBILITY_MODE=libfuzzer",
         #   "MAKE_BUILD_TYPE=RelWithDebug",
-        # ]
-
-        #cflags = [ "-Wno-error=format-nonliteral" ] CAN NOT USE since strict_warning defines the opposite
+        #  ]
 
         sources = [ _test ]
         output_dir = _test_output_dir

build/toolchain/pw_fuzzer/BUILD.gn

@@ -48,6 +48,11 @@ gcc_toolchain("chip_pw_fuzztest") {
     current_cpu = host_cpu
     is_clang = true
 
+    # the upstream pigweed host_clang toolchain defines a default sysroot, which results in build errors
+    # since it does not include SSL and is supposed to be minimal by design.
+    # by removing this default config, we will use the system's libs. Otherwise we can define our own sysroot.
+    remove_default_configs = [ "$dir_pw_toolchain/host_clang:linux_sysroot" ]
+
     # pw_toolchain_FUZZING_ENABLED = true
     treat_warnings_as_errors = false